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probability cards perfect numbers geometric mean chess rugby partitions balancing geometric means dates chalkdust crossnumber crossnumber unit fractions star numbers spheres determinants colouring crossnumbers means gerrymandering pentagons shape prime numbers products square grids mean folding tube maps cubics ave cube numbers 3d shapes factorials medians lines money square numbers indices odd numbers pascal's triangle coins median people maths dominos consecutive integers menace matrices even numbers arrows wordplay perimeter triangles area digits powers planes doubling volume chocolate tiling functions sums multiplication cryptic clues sets factors albgebra speed sequences taxicab geometry clocks angles advent rectangles scales books binary christmas logic calculus crosswords quadratics axes games parabolas digital clocks dodecagons symmetry tournaments quadrilaterals palindromes elections neighbours 2d shapes digital products integers polynomials decahedra surds grids probabilty coordinates fractions dice consecutive numbers combinatorics the only crossnumber integration squares numbers bases irreducible numbers sum to infinity hexagons averages shapes cryptic crossnumbers algebra number multiples expansions sport graphs numbers grids proportion trigonometry geometry addition square roots polygons floors tangents remainders triangle numbers complex numbers circles percentages range ellipses division differentiation time routes regular shapes